arduino xbee communication

Projects Networking, Protocols, and Devices
1

so I am trying to transmit analog data from a ps2 button to an xbee. my sending xbee is the router that is connected to an arduino uno. my receiving xbee is the coordinator that is connected to an arduino mega 2560. when i send data i can receive all of it perfectly in xctu but when i connect the receiving xbee to the arduino mega with the code below it won't go in the second loop (XBeeResponse().getApiId()==ZB_RX_RESPONSE).

sender code:

#include <XBee.h>

XBee xbee = XBee();

uint8_t ps2Button[2]; //= "Hallo War";

XBeeAddress64 addr64 = XBeeAddress64 (0x0013A200, 0x4125704D);
ZBTxRequest zbTx = ZBTxRequest (addr64, ps2Button, sizeof(ps2Button));
ZBTxStatusResponse txStatus = ZBTxStatusResponse();

int YValue = 0;
const byte errorLed = 4;
const byte statusLed = 6;
const byte succesLed = 8;

void setup()
{
pinMode (errorLed, OUTPUT);
pinMode (statusLed, OUTPUT);
pinMode (succesLed, OUTPUT);

Serial.begin(9600);
xbee.setSerial(Serial);
}

void loop()
{
YValue = analogRead (A0);
//YValue = map(YValue, 0, 1023, 0, 510);
ps2Button[0] = YValue >> 8 & 0xFF;
//Serial.println (ps2Button[0]);
//Serial.print (" ");
Serial.println (YValue);
ps2Button[1] = YValue & 0xFF;

xbee.send(zbTx);

flashLed (statusLed, 2, 100);

if (xbee.readPacket(5000))
{
flashLed (succesLed, 5, 100);
if (xbee.getResponse().getApiId() == ZB_TX_STATUS_RESPONSE)
{
xbee.getResponse().getZBTxStatusResponse (txStatus);
if (txStatus.getDeliveryStatus() == SUCCESS)
{
flashLed (statusLed, 5, 50);
}
else
{
flashLed (errorLed, 3, 500);
}
}
}
else if (XBeeResponse().isError())
{
Serial.print ("error reading packet. error code: ");
Serial.println (xbee.getResponse().getErrorCode());
}
else
{
flashLed (errorLed, 2, 50);
}
delay (1000);
}

void flashLed (byte pin, byte times, int wait)
{
for (int i = 0; i < times; i++)
{
digitalWrite (pin, HIGH);
delay (wait);
digitalWrite (pin, LOW);
if (i + 1 < times)
{
delay (wait);
}
}
}

receiver code:

XBee xbee = XBee();

ZBRxResponse rx = ZBRxResponse();
ModemStatusResponse msr = ModemStatusResponse();

Servo FrontLeftMotor;
Servo BackLeftMotor;
Servo FrontRightMotor;
Servo BackRightMotor;

const byte statusLed = 8;
const byte errorLed = 4;
const byte dataLed = 6;
int currentYValue = 0;
int multiMotorSpeed = 0;

void setup()
{
pinMode (statusLed, OUTPUT);
pinMode (errorLed, OUTPUT);
pinMode (dataLed, OUTPUT);
FrontLeftMotor.attach(3);
BackLeftMotor.attach(5);
FrontRightMotor.attach(7);
BackRightMotor.attach(9);

Serial.begin (9600);
xbee.begin(Serial);

flashLed (statusLed, 3, 50);
}

void loop()
{
xbee.readPacket();
flashLed (statusLed, 1, 100);
if (XBeeResponse().isAvailable())
{
XBeeResponse().getZBRxResponse(rx);
flashLed (dataLed, 3, 25);
uint8_t analogMSB = rx.getData (0);
uint8_t analogLSB = rx.getData (1);
currentYValue = analogLSB + (analogMSB * 256);
Serial.println (currentYValue);
if (rx.getOption() == ZB_PACKET_ACKNOWLEDGED)
{
flashLed (statusLed, 10, 10);
}
else
{
flashLed (errorLed, 2, 20);
}
servoControl();
if (XBeeResponse().getApiId() == MODEM_STATUS_RESPONSE)
{
XBeeResponse().getModemStatusResponse(msr);
if (msr.getStatus() == ASSOCIATED)
{
flashLed (statusLed, 10, 10);
}
else if (msr.getStatus() == DISASSOCIATED)
{
flashLed (errorLed, 10, 10);
}
else
{
flashLed (statusLed, 5, 10);
}
}
else
{
Serial.println ("error");
flashLed (errorLed, 1, 100);
}
}
else if (XBeeResponse().isError())
{
Serial.print ("error reading packet. error code: ");
Serial.println (XBeeResponse().getErrorCode());
}
delay (100);
}

void servoControl()
{
static int lastYValue;
if (currentYValue == 0)
{
multiMotorSpeed = 0;
FrontLeftMotor.write (multiMotorSpeed);
BackLeftMotor.write (multiMotorSpeed);
FrontRightMotor.write (multiMotorSpeed);
BackRightMotor.write (multiMotorSpeed);
}
if (lastYValue > (currentYValue + 10) || lastYValue > (currentYValue - 10))
{
multiMotorSpeed = multiMotorSpeed - 10;
FrontLeftMotor.write (multiMotorSpeed);
BackLeftMotor.write (multiMotorSpeed);
FrontRightMotor.write (multiMotorSpeed);
BackRightMotor.write (multiMotorSpeed);
}
if (lastYValue < (currentYValue + 10) || lastYValue < (currentYValue - 10))
{
multiMotorSpeed = multiMotorSpeed + 10;
FrontLeftMotor.write (multiMotorSpeed);
BackLeftMotor.write (multiMotorSpeed);
FrontRightMotor.write (multiMotorSpeed);
BackRightMotor.write (multiMotorSpeed);
}
lastYValue = currentYValue;
}

void flashLed (byte pin, byte times, int wait)
{
for (int i = 0; i < times; i++)
{
digitalWrite (pin, HIGH);
delay (wait);
digitalWrite (pin, LOW);
if (i + 1 < times)
{
delay (wait);
}
}
}

2

but when i connect the receiving xbee to the arduino mega with the code below it won't go in the second loop (XBeeResponse().getApiId()==ZB_RX_RESPONSE).

I don't know what you mean by this statement. You have an if STATEMENT (which is NOT a looping construct) that compares the value returned by getApiId(), but it does not compare it to ZB_RX_RESPONSE.

Why don't you print out the value that getApiId() returns, and compare (manually) that to the list constants defined in XBee.h. Perhaps a clue will present itself.

3

yeah sorry wrong use of words.

So I printed out the value of getApiId() and then I checked to wich constant it belongs to. The ApiId() == 4 and the constant for this is BROADCAST_OPTION but even after a while of searching I can't find what I should do now.

4

Since you have one sender and one receiver, with known addresses, and since the XBee isn't do anything more than being a radio, I'd dump the XBee library and put the XBees in AT mode.

Send "", where yyy is the value in YValue. Use Robin2's serial input tutorial to read the data.

http://forum.arduino.cc/index.php?topic=396450.0

5

I agree 100% with PaulS.

Also, how are you powering the XBees? I hope they're on external power supplies and not powered from the Arduinos.